Question

If the curved surface area of a hemisphere is $8\pi m^2$, then the radius is.

• A. $2m$
• B. $4m$
• C. $8m$
• D. $6m$

Answer 1

The correct option is A $2m$

Let, the radius of the hemisphere be $r$.

We know that, curved surface area of a hemisphere
$=2\pi r^2$

Given that, curved surface area of the hemisphere is $8\pi m^2$.

$\Rightarrow 2\pi r^2=8\pi$
$\Rightarrow r=2m$